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All Journal Jurnal Teknik Elektro Jurnal Ilmiah Setrum Jurnal ELTIKOM : Jurnal Teknik Elektro, Teknologi Informasi dan Komputer Techne : Jurnal Ilmiah Elektroteknika TESLA: Jurnal Teknik Elektro TELKA - Telekomunikasi, Elektronika, Komputasi dan Kontrol Jurnal Informatika dan Rekayasa Elektronik Jurnal Ilmiah Teknik Elektro
Kiki Prawiroredjo
Universitas Trisakti
Aerospace Engineering Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering

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Journal : Jurnal Teknik Elektro

 1 
PENGATUR KECEPATAN MOTOR DC DENGAN SENSOR SUHU BERBASIS MIKROKONTROLER ATMEGA16 Prawiroredjo, Kiki; Rahardjo TS, Kuat; Stevanus, Stevanus
Jurnal Teknik Elektro Vol 9, No 1 (2009)
Publisher : Jurnal Teknik Elektro

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A telecommunication cabinet usually uses a Direct Current fan with a Direct Current motor (DC motor) to make the cabinet temperature does not exceed the temperature that is allowed. Using a DC motor has weaknesses because it always rotates in full speed although the temperature in the cabinet gets down already. It causes inefficiency of the power consumption and the DC motor’s lifetime is not long enough.The prototype of DC motor speed controller controls the speed of a DC motor with the temperature environment as its reference. This circuit is built by a temperature sensor LM35, a microcontroller ATmega16 as the processor that analizes the input from the temperature sensor and relays. This prototype is equipped with a Liquid Crystal Display (LCD) to display the temperature of the cabinet and the DC motor speed. After the prototype is assembled and tested, it is known that the circuit controls a DC motor speed according to the changes of the temperature that has been determined by the software program. The DC motor stops rotating if the temperature sensor senses the temperature below the minimum temperature level.Keywords: DC motor, temperature sensor, LCD, microcontroller
DASAR-DASAR VOICE OVER INTERNET PROTOKOL Prawiroredjo, Kiki
Jurnal Teknik Elektro Vol 2, No 1 (2002)
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Voice over IP (VoIP) technology enables the real time transmission of voice signals aspacketized data over IP networks that employ the Transmission Control Protocol (TCP),Real Time Transport Protocol (RTP), User Datagram Protocol (UDP), and InternetProtocol (IP) suite. In VoIP systems, analog voice signals are digitized and transmitted as astream of packets over a digital data network. IP networks allow each packet toindependently find the most efficient path to the intended destination, thereby best using thenetwork resources at any given instant. The packets associated with a single source may thustake many different paths to the destination in traversing the network, arriving with differentend to end delays, arriving out of sequence, or possibly not arriving at all. At the destination,however, the packets are reassembled and converted back into the original voicesignal.VoIP technology insures proper reconstruction of the voice signals, compensating forechoes made audible due to the end to end delay, for jitter and for dropped packets.Variation among VoIP products include the algorithms and implementations used to supportdynamic bandwidth allocation, packet loss recovery, adaptive echo cancellation and speechprocessing to deliver voice quality as high as possible.Keywords: Voice over IP (VoIP), gateway, Digital Signal Processing (DSP)
PENGATUR KETINGGIAN AIR OTOMATIS Prawiroredjo, Kiki; Susantio, Ignatius Melvin
Jurnal Teknik Elektro Vol 9, No 2 (2010)
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The Automatic Water Level Control is a prototype circuit that controls the availability of water in a tank. The water tank has five water levels to control the pump work. The water level control system consists of two water containers, one for the water source container and the other for the water reservoir and two water pumps. The circuit consists of an infrared system, two relays to activate the water pumps and a 2x16 Liquid sensor to detect the water level, a microcontroller Atmega 8535(L) to control all the circuit Crystal Display (LCD) to display the water level in the tank reservoir and the pump condition. After the water level control circuit has been built and tested, it is known that at the minimum level position that is 30 cm between sensor and the float, the output voltage of the infrared sensor is 0,85 volt and the microcontroller will turn on both the water pumps. At the maximum level position that is 11.5 cm between sensor and the float, the output voltage of the infrared sensor is 2,17 volt and the microcontroller will turn off both of the water pumps. Keywords: Water level control, infrared sensor, Microcontroller, LCD
ROBOT PENGANTAR BARANG OTOMATIS BERBASIS MIKROKONTROLER AVR ATMEGA16 Prawiroredjo, Kiki; Iriyanto, Iriyanto
Jurnal Teknik Elektro Vol 8, No 1 (2008)
Publisher : Jurnal Teknik Elektro

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Automatic Object Delivery Robot Based on AVR ATMega16 Microcontroller is a robot thatdelivers goods to a certain location and move back to its initial position automatically, andavoids obstacles to reach any location. This Robot is built by using two stepper motors formoving forward and backward, and SHARP GP2D12 infra red sensor connectedmechanically to the servo motor in order to turn the sensor around 45 degrees to detect theexistence of any obstacle at a certain distance around the robot. Transmitter in the sensorwill transmit infra red light and if there are obstacles at a distance of 10 to 36.7 cm, the infrared light will be reflected to the sensor. AVR ATMega16 Microcontroller as the processorwill analyze the area of the obstacles at certain distance and move the robot to the areawhere there is no obstacle. After being assembled and tested, this robot can go to itsdestination and back to its initial position as programmed. There are errors as the robotreaches its destination. For example, the destination coordinate is x=2 and y=6 becomesx=1,95 and y=6, and the initial position coordinate is x=2 and y=0 becomes x=1,7 andy=0 when tested without obstacles, and the coordinate becomes x=1,4 and y=0 when testedwith obstacles. These errors occur due to inaccuracy of stepper motor rotation.Keywords: Robot, Microcontroller, stepper motor, servo motor, infrared sensor.
DETEKTOR JARAK DENGAN SENSOR ULTRASONIK BERBASIS MIKROKONTROLER Prawiroredjo, Kiki; Asteria, Nyssa
Jurnal Teknik Elektro Vol 7, No 2 (2008)
Publisher : Jurnal Teknik Elektro

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A Distance Detector is a circuit that is built using ultrasonic sensor to detect objects aroundone`s car and AT89S52 microcontroller as the processor. An Ultrasonic sensor will detectobjects around the car. The sensor’s transmitter will transmit ultrasonic waves. If theultrasonic waves bounce back to the receiver, it means that there is an object around the car.Microcontroller will count the time needed to receive the ultrasonic waves and determine thedistance between the object and the car. The distance can be read from the Liquid CrystalDisplay (LCD) or Light Emitting Diode (LED) panel that is placed in front of the car driver.After being assembled and tested, this device works properly. This device can detect anobject up to the distance of 2 meters from the sensor. The deviation between the real distanceand the calculated one ranges from 0.82% to 34.40%. the longer the distance, the smallerthe deviation.Keywords: ultrasonic sensor, microcontroller, distance, LCD, LED
SIMULASI FILTER SALLEN KEY DENGAN SOFTWARE PSPICE Prawiroredjo, Kiki
Jurnal Teknik Elektro Vol 6, No 2 (2007)
Publisher : Jurnal Teknik Elektro

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A Sallen–Key filter is a type of active filter, particularly valued for its simplicity. The circuitproduces a 2-pole (12 dB/octave) lowpass or highpass response using two resistors, twocapacitors and a buffer amplifier or operational amplifier. By varying the gain of theamplifier the filter will have a certain type of frequency response such as Bessel, Butterworthor Chebyshev. Higher-order filters can be obtained by cascading two or more stages. Thisfilter topology is also known as a voltage controlled voltage source (VCVS) filter. The opampprovides buffering between filter stages, so that each stage can be designedindependently. PSpice software can be used to simulate the filter circuits and the frequencyresponse can be analyzed before the circuits are built. Designers can change the frequencyresponse easily by changing the values of the components in the filter design by PSpicesoftware. The results of the simulation show that the Bessel response has the lowest outputvoltage and the lowest roll-off, Butterworth frequency response has higher output voltagethan Bessel and as the most stable one but Chebyshev response has the highest outputvoltage and the highest roll-off but not stable.Keywords: Sallen-Key filter, PSpice software, frequency response, lowpass filter, highpassfilter, Operational Amplifier, Bessel, Butterworth, Chebyshev.
Co-Authors Addy Rachmad Nurcahyo Ahmad Rizqi Saifuddin Aldi Maulana Arief Aditya Rangga Aulia Eka Putra Engelin Shintadewi Julian Gunawan Tjahjadi Hartono Hartono Henry Candra Henry Candra Ignatius Melvin Susantio Ikhsan Saputra Iriyanto Iriyanto Iznih Iznih Khalifa, Arfend Atma Maulana Kuat Rahardjo T.S. Melvin Nurohman Nadhif Fauzan Nyssa Asteria Samuel H Tirtamihardja Stevanus Stevanus Susan Sulaiman